This is my third year with pool. After first two winters my water was greenish but not too bad so i was able to start the pool in a spring .This year it was stinking swamp with frogs and green slime in it. So, I've drained it completely and filled it from my pond. The water was slightly greenish bit transparent when I've done it. I have balanced pH and added chlorine at night .The next morning water became brown. It is clear, but brown. I did some research on internet and suspect that this is iron. Our well water got a LOT of iron and manganese.
Before proceeding with any action I want to ask fellow members for opinions.